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Discussion Forum
Show Parts for Model:

!HELP! 46 A runs on 1(this is a long one)

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AC

08-14-2002 06:41:15
63.184.129.211



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I bought a 46 A the other day. Nice, barn kept, very straight and complete. But, it runs very well on the right cylinder. The left cylinder tries to run. I'm not quite sure how to explain it. It hits, then doesn't. ALMOST like a very slightly stickey valve. THe guy I purchased it from told me about the situation and said that he never could figure it out. He ran the valves countless times, it has a new carb on it, the manifold has a new gasket and it does not leak, the head suppossedly has been magnafluxed, the valves/springs suppossedly look good, the compression is a little low, but the tractor burns absolutely nothing and does not smoke at all. It is on a distributer, but we put in a hot mag before I bought it just to test it. Nothing. The plug wires are good. I'm running out of options here...He told me that he bent a pushrod when he had the head off, but he straightened it out. I've seen them run with crooked pushrods, but I don't think that it is the problem....Does anyone think that the cam is round on one of the lobes? Maybe it needs 2 quarts of Marvel and about a good hour pulling my truck around the yard just to loosen everything up. The tractor has not done much in the last 9 years or so. Just to those who wonder, I have a truck to pull around the yard because I have not found a field I can afford yet...ha-ha

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WTW

08-14-2002 07:41:54
192.43.65.245



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 Re: !HELP! 46 A runs on 1(this is a long one) in reply to AC, 08-14-2002 06:41:15  
AC, Your symptoms are a classic sign of a failed left hand cam bearing. To check for this remove the cam bearing cover / cap located on the left side of crankcase at about 11 O-clock outside flywheel diameter. You will have to remove the flywheel cover to do this. Good chance that the rollers in the tapered roller bearing will fall out when you remove it or they may not even be there. If you can hear allot of gear noise when the engine is running that too a sign the cam bearing has failed. What happens is when the cam bearing fails the valves on number one cylinder does not only not open far enough but sometimes when valve lash is adjusted with a bad bearing the failed bearing will allow the bearing rollers to chase from side to side of race as the cam lobe works the lifter. That is why it will run different from one moment to another. Not hard to check, let us know what you learn. Good Luck Dave W.

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AC

08-15-2002 11:51:19
65.146.9.15



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 Re: Re: !HELP! 46 A runs on 1(this is a long one) in reply to WTW, 08-14-2002 07:41:54  
Dave... I dug into the crankcase even before I picked up your post. With your information, I took as much of a look as I could inside the left half of the engine. Of course there is barely any room for me to get my big nugget and light in there, but I did find a lot of metal shavings right underneath on a ledge of the crankcase wall where the bearing cup and that large gear that the cam goes through come together. I tried to remove the cap like you told me, however, I can't get it all the way out. Do I have to disconnect the cam from the large gear with the three bolts that go through it, or should I keep prying the cap off? I was thinking that the cap would not come all the way out until I took the tension off the bearing...am I right or wrong? When I put a wrench on the bolt inside and put pressure on it, I can feel the camshaft twist and move. Maybe it is because of the cup being halfway out and since the bearing is tapered, there is nothing to hold the cam in a true line......Looks like you've been right so far....Thanks for the help, and I hope I get more......AC

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WTW

08-15-2002 12:35:59
192.43.65.245



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 Re: Re: Re: !HELP! 46 A runs on 1(this is a long one) in reply to AC, 08-15-2002 11:51:19  
AC, You should be able to pull / pry the bearing cap / holder from the left side of the case. The spring on the other end of cam will push a little until the cam gear and hub contact the side of the case. You do not have to remove the cam gear from the camshaft. I have replaced this bearing from the left side of the engine without removing any thing more than the camshaft cover. The biggest trick was to get the old bearing race from the camshaft. I just warmed the new bearing in hot oil and slipped it on with a pair of leather gloves. Not be able to remove the cover makes me wonder just how bad the bearing is ?? There is no oil line hooked to the cover it should come out with little or NO big effort. Let me know what you learn Good Luck Dave W.

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AC

08-15-2002 19:22:08
67.209.180.99



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 Re: Re: Re: Re: !HELP! 46 A runs on 1(this is a long one) in reply to WTW, 08-15-2002 12:35:59  
All right we all make mistakes...my first was starting the late morning with pizza and chocolate milk.....I hadn't had a bite in 2 days....I wish I would have just gone hungry.... ANYWAY, there is a nut on the casting which extends to the flywheel. From my perspective, the cap would clear it. Not how it happened. It only took me three hours to figure it out. Well, when I removed the nut, the cap came right out like it should. Guess what? The roller bearings (the 3 left) were more like little rectangles. It ruined the cap,(totally ate it out in an oblong shape ) and now it looks as if I am going to have to replace the cam. I'm not sure yet. The farthest over left lobe feels like ut has a flat spot on one side....I don't know how to get the race off.....
SO, I took 3 hours this evening and went fishing to relax. It worked,and I caught a 9 lb catfish. Now I am hitting the hay as they say. I would have never looked under the cap, if you had not mentioned it. Thank you so very much. I will post my further progress this weekend....'night...AC

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Joe Duling

10-26-2003 08:00:19
216.255.13.137



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 Re: Re: Re: Re: Re: !HELP! 46 A runs on 1(this is in reply to AC, 08-15-2002 19:22:08  
If he bent a push rod there's has to be reason why. I would check the rockers if they are free or the timing. I had one just like that but sold it after I got it running. When I started it for the first time I had bird feathers come out of the exhaust.Talk about laugh that was a worth a good one. Then it only ran on one cylinder. I found that the other rocker was rusted fast to the rocker shaft and the push rod bent the rocker in half. I found another rocker polished the shaft that fixed that problem. It ran good after that. I also have a 1944 B I could never get it to run smooth. I replaced the carb new plugs,wires thought I had it but I was wrong. I thought I would look at the electrical a little more. I cleaned all the contact points in the mag cap and the points with fine sand paper. It ran like a charm after that. That gives you a good feeling when you find the problem. What made me look there was it would run on one then the 2nd would fire every so often. So I pulled the plug wire of the good one then the second one ran perfect. That told me the problem had to be in the mag. Good luck but don't give up.

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Lary

08-14-2002 14:07:47
204.39.232.24



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 Re: Re: !HELP! 46 A runs on 1(this is a long one) in reply to WTW, 08-14-2002 07:41:54  
WTW; I have an A that acts the same way,thanks for the cam bearing tip ,I hope that's the prob.



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